+ return this.findFirstFreeWorkerNodeKey()
+ }
+
+ /**
+ * Finds the first free worker node key based on the number of tasks the worker has applied.
+ *
+ * If a worker is found with `0` running tasks, it is detected as free and its worker node key is returned.
+ *
+ * If no free worker is found, `-1` is returned.
+ *
+ * @returns A worker node key if there is one, `-1` otherwise.
+ */
+ private findFirstFreeWorkerNodeKey (): number {
+ return this.pool.workerNodes.findIndex(workerNode => {
+ return workerNode.tasksUsage?.running === 0
+ })
+ }
+
+ /**
+ * Finds the last free worker node key based on the number of tasks the worker has applied.
+ *
+ * If a worker is found with `0` running tasks, it is detected as free and its worker node key is returned.
+ *
+ * If no free worker is found, `-1` is returned.
+ *
+ * @returns A worker node key if there is one, `-1` otherwise.
+ */
+ private findLastFreeWorkerNodeKey (): number {
+ // It requires node >= 18.0.0:
+ // return this.workerNodes.findLastIndex(workerNode => {
+ // return workerNode.tasksUsage?.running === 0
+ // })
+ for (let i = this.pool.workerNodes.length - 1; i >= 0; i--) {
+ if (this.pool.workerNodes[i].tasksUsage?.running === 0) {
+ return i
+ }
+ }
+ return -1